Highway marker



FIG. 1 is a front elevational view of a highway marker showing my new design, the rear elevational view being a mirror image thereof;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for highway marker, as shown and described. 